Producing methanol from CO2 would make valuable fuel from potentially dangerous waste. Nature shows the way in its photosynthetic use of the hydride-donor NADPH. That molecule was the inspiration for Tanaka's pbn (pbn = 2-(2-pyridyl-benzo[b]-1.5-napthyridine), the doubly reduced/doubly protonated pbnHH form of which presumably electrocatalytically reduced acetone to isopropanol (Angew. Chem. Int. Ed. 2005, 44, 5891-5894). Fujita et al. prepared Ru(pbnHH)(bpy)22+ (bpy = 2,2'-bipyridine) by irradiating Ru(pbn)(bpy)22+ with visible light (Angew. Chem. Int. Ed. 2007, 46, 4169-4172). The mechanism involves pooling two photons in a disproportionation step (Fujita et al., Inorg. Chem. 2008, in press). Our DFT calculations indicate that it may be possible to harvest a third photon to form the triply reduced, doubly protonated Ru(pbnHH.-)(bpy)2+. Our calculations also indicate that this molecule is sufficiently "hydritic" to reduce a metal-bound carbonyl on CpReNO(CO)2. Spin density calculations are consistent with the proposed mechanism.